package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 1.判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 2.如果已经存在了，只需要将数量+1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumber(cart);
        }else {
            // 3.如果不存在就加入一条数据

            // 判断本次添加的是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                Dish dish = dishMapper.getByid(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());

            }else {
                SetmealVO setmealVO = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmealVO.getName());
                shoppingCart.setAmount(setmealVO.getPrice());
                shoppingCart.setImage(setmealVO.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }



    }

    @Override
    public List<ShoppingCart> list() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }

    @Override
    public void deleteOneShop(ShoppingCartDTO shoppingCartDTO) {
//        Long currentId = BaseContext.getCurrentId(); // 当前用户id
//        Long dishId = shoppingCartDTO.getDishId();
//        ShoppingCart cart;
//        if (dishId != null){
//            cart = ShoppingCart.builder().userId(currentId).dishId(dishId).build();
//        }else{
//            cart = ShoppingCart.builder().userId(currentId).setmealId(shoppingCartDTO.getSetmealId()).build();
//        }
//        List<ShoppingCart> list = shoppingCartMapper.list(cart);
//        ShoppingCart shoppingCart = list.get(0);
//
//        shoppingCart.setNumber(shoppingCart.getNumber() - 1);
//
//        Integer number = shoppingCart.getNumber();
//        if(number < 1){
//            shoppingCartMapper.deleteById(shoppingCart);
//        }
//        shoppingCartMapper.updateNumber(shoppingCart);

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();

            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumber(shoppingCart);
            }
        }

    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}



























